Electromagnetic device



Dec. 12, 1933. w. c. SLAUSON 1,938,726

ELECTROMAGNETIC DEVICE Filed Nov. 25, 1932 26 25 FIG, 34 36 32 4 i l 33 l I //V VE N TOP We SLAUSON I ATTORNEY Patented Dec. 12, 1933' Application November 25, 1932 Serial No.644,225

7 Claims; (01. 175-336).

This invention, relates to supports for electrical apparatus and more particularly to means for mounting, Ldelicately adjusted relays.

i .It .has become 1 common practice in the design ,5 .of' electromagnetic relays and particularly of relays employed in the art of telephony to pro- "vide' each device with a protective casing,-. such as a metal container! which, with-its associated cover,-' completely, encases the operating parts 7 19 of the relay andrenders the relay dust and dirt proof. I

Though casings ofthis type are very-essential to satisfactory maintenance of suchelectroinagnetic:.relays,=ithasbeen found that they present 1 :a-source of disturbance, particularly to highly sensitive types of relays, such as are used on long I telephone lines for signaling purposes. The highly sensitiverlay is usually adjusted prior to its assembly on the relay mounting plate 'but provision must also be made to permit minor adjustments to bemade after installation. In assembling a relay of this type on a relay mounting plate after adjustmentand in removing and replacing the cover, cap for adjustment purposes, it hasbeen experienced thatthe relay mounting base is subjected" tostrains and stresses which are imparted to the relay' structure itself and tend to'pla'ce the" relay out of adjustment.

It is the object, therefore, of this invention to render-highlysensitive relays immune to stresses and strainsexperienced; by their associated 1' mounting bases and thereby stabilize the. adjustments of such devices. 1 I 'I'hisobject isattained in'accordance with a feature of the invention by substantially isolating the relay structure from" its associated mounting base and securing it thereto atja point at which the stresses" and strains experienced by the mounting'Tbase-are' at'a minimum and practically negli ible. 1 I1 invention will be readily'understood from the-"following detailed description made with reference 'to the accompanying drawing in which; i

ig. 115 an enlarged'side elevation of a highly sensitive type relay housed in a protectivecasing, the latter being brokenflaway to show the base in accordance with a feature of this invention;

Fig. 2 is an exploded view of the combination of relay, auxiliary mounting base, cover' and cover cap showing the relative dispositions of each, parts of the various elements being broken substantially I shaped, consisting of the. integral .mensions of end portions 11 and 12 of the :away to give a better understanding of the construction -Fig.';3' is a bottom plan viewQof the relay and its associated mounting base, and

, Fig. 4 is a front end view of the relay shown in the other figures.

Referringto the drawing in detail, the mounting base generally indicated by the numeral 10, ,upon which the relay structure is mounted is portions 11, 12 and 13, theportions 11 and .12 as seatsupon which the rear and front ends ot the relay rest respectively. It is believed unnecessary to describe the parts vof which the relay. per. se is constituted, as 'these details do notinvolve features of the present invention. His only essential to point out that the mounting .base- 10 carries the entire relay structure. which is, secured to the base 10 by means of the two screws 14 at the rear and the ten screws 21 at the front end. These screws are countersunk so as to present a smooth sur- ;facewith the under face of the mounting base.

The intermediate portion 13 of the mounting base 19 is slightly raised out of the plane in which the endportions 11 and 12 lie. The

.purpose of this construction is to permit a substantially: dovetail association of the base 10 with the, auxiliary mounting base 15, as will -,presently,appear.

The auxiliary mounting base 15 is substan tially trough -shaped, being open at the front end to permit the relay per se and its associated mounting base 10 to he slipped into position therein, and alsoto'permitadjustments of the relay. to be made while in service. The base of the trough-shaped mounting base 15 is provided withtwo rectangular apertures 16 and 17 which correspond in size substantially to the dimounting base 10. These apertures are effected by the integral transverse portion 18 -Jthewportion, 18 of the latter -so that the end' m d f i theirelay on the auxlhary "portions 11, and 12 01 the base-10 substantially fit into the apertures 16 and 1'7 respectively. The bridging portion 13 is provided with two transversely disposed tapped holes and the portion 18 of base 15 is provided with two countersunk holes which come into alignment with the tappedholes in the part 13 when the relay is .1

positioned on the auxiliary mounting base 15.

Two screws 22 fit into the countersunk holes in part 18 and are screwed into the tapped holes in part 13, each screw being provided with a washer 23 which is interposed between the parts 13. and'lS.

From the construction so far described... it .is

evident that the entire relay and its mounting A cover or container 25 having a'rectangular.=

section is secured to the auxiliary mounting base by means of screws 26,27 and 28. The

' screws 26, there being two in number, secure the cover to a U-shaped bracket 29, only one side of which is shown in the drawing, which in turn is secured to auxiliary mounting base 15 by screws 30. The screws 28 which fit into the tapped holes 31 secure the frontend of the cover 25 to the base 15 whereas the screws 2'7 secure the rear portionof the cover- 25 to the base 15.

The cover cap consists of a rectangular face plate 32, to which is secured afinger'grip 33 by 'virture of which the cap may be readily placed in and removed from association .with

the cover. 'An L-shaped element of'resilient spring material has one side '35fthereof permanently secured to the face plate 32, theporand adapted to slide into position between the front upper surface of the cover 25 and the upper edges of the portions 36 :of thetrough like base 15, as clearly shown in Fig. 1. From either side of the portion 35 extend three prongs 37 which serveto secure thecap in position, the center prongs being'provided with a lip which engages with the outer edges of the apertures 38 located in the portions 36 of base 15, when the cap is in-position on the structure.

It will be noted that when the cap is placed in position or removed therefrom, the portion 34 rides over the upper edges of the base portions 36 thereby subjecting the base to stresses and strains which, with the usual type mount- I ing, would be imparted to therelay per se' .10 which supports the relay per se from the auxiliary mounting base 15, the former, and consequently the relay per se, do not experience the stresses and strains to which the base 15 is subjected. This is due to thefact that any stresses or trains experienced by the base 15 are of minimum magnitude and practically negligible at its transverse center line and since the relay mounting base 10 is secured to the" base 15 substantially at its transverse center line, the

forces which tend to throw the relay'out of adjustment and which-are transmitted to the relay mounting base 10 are therefore of minimum magnitude and practically negligible and the trical apparatus, comprising a mounting base upon which theapparatus is secured and supported and an auxiliary mounting base secured to said first mounting base substantially at its transverse center line only.

2. A. mounting for delicately adjusted electrical apparatus, comprising a mounting base upon which the apparatus is secured and supported and an auxiliary mounting base secured at only two points to said first mounting base, the .said 'points being positioned substantially on the transverse center line of said auxiliary mounting base.

3. A mounting for delicately adjusted electrical apparatus comprising two mounting bases, one of said mounting bases serving as a support -for-the electrical apparatus and the :other of saidmounting bases supporting said first mounting base v in substantial equilibrium 'on a line support coinciding substantially with thetrans- 'verse center linesof'both said mounting: bases.

4. A mounting for an electromagnetic relay, a mounting base upon which the elements .of saidrela'y are supported and asecondimounting base in mechanical engagement :with said first mounting base at but two points, said :points being located substantially on 'the transverse center lines of both'saidbases. L

5. In combination, a relay, a mounting :base

upon which said relay issupported, a second mounting base, a cover encasing said relay and said mounting bases, a mentor said cover adaptmitted to said relay.

'6. In combination, a relay, a mountingibase upon which said'relay 'is mounted, a troughlikereceptacle housing said relay and itsmount- 'mg base, a cover for said trough-like receptacle, relay and mounting base, a cap for "said cover having a "portion thereofxfitting between said trough-like receptacle and said cover and capwhen placed in position,*and means joining said mounting base and said trough-like receptacle "substantially at their transverse center linesonly to render said relay'immune to the strainex-i erted upon said trough-like receptacle by positioning. said capon said cover. i

r v .7. A mounting'fordelicately, adjustedelectromagnetic devices comprising ;am0unting base normally subject to stresses and-strains, an aux- 1 magnetic device, and'meansfor rigidly'securing iliary mounting base supporting said electrosaid bases together substantially at their center its ed-to exert a strain upon said second mounting able of exerting astrain upon said receptacle lines and rendering said auxiliary mounting base and 'its associated electromagnetic deviceimmune to the'stresses and strains WILLIAM c, ,snA son. 

